Net Power Production and Performance at Different Stroke Rates and Abilities during Pair-oar Rowing: Richard Smith and Constanze Loschner

2012 ◽  
pp. 283-287
Keyword(s):  
Power Production ◽  
And Performance

scholarly journals A method to analyze power output of vertical-axis wind turbines under rain

2018 ◽  
Vol 56 (6) ◽  
pp. 761
Author(s):  
Duc Huu Nguyen
Keyword(s):  
Wind Turbine ◽  
Power Output ◽  
Vertical Axis ◽  
Power Production ◽  
Vertical Axis Wind Turbine ◽  
Physical Processes ◽  
Vertical Axis Wind Turbines ◽  
Rain Drops ◽  
Weather Changes ◽  
And Performance

A method to analyze effect power output of a vertical axis wind turbine under rain is proposed. The rain had the effect of increasing the drag, slowing the rotational speed of the wind turbine and decreasing the power and performance. More and more ambitious projects for wind turbine production being set on many where on Vietnam, it is necessary to understand all the factors, especially by weather changes, that might affect wind power production. In this research, we lay out a model to estimate the effect of rainfall by simulating the actual physical processes of the rain drops forming on the surface of the blades of a vertical-axis wind turbine (VAWT), thereby determining optimal wetness, then power and performance respectively. This could have an effect on the control strategy necessary for designing and controlling wind turbine.

Compared Thermal Modeling of Anode- and Electrolyte-Supported SOFC-Gas Turbine Hybrid Systems

2020 ◽  
Vol 18 (1) ◽  
Author(s):  
Abdulrazzak Akroot ◽  
Lutfu Namli ◽  
Hasan Ozcan
Keyword(s):  
Fuel Cell ◽  
Hybrid Systems ◽  
Hybrid System ◽  
Operating Temperature ◽  
Power Production ◽  
Solid Oxide ◽  
System Model ◽  
Oxide Fuel ◽  
System Operation ◽  
And Performance

Abstract In this study, two solid oxide fuel cell (SOFC) hybrid systems (anode-supported model (ASM) and electrolyte-supported model (ESM)) is developed in matlab® and compared. The hybrid system model is considered to investigate the impacts of various operating parameters such as SOFC operating temperature and steam/carbon ratio on power production and performance of the hybrid system where it is projected that results can be utilized as guidelines for optimal hybrid system operation. According to the findings, a maximum 695 kW power is produced at 750 °C operating temperature for the anode-supported model, whereas 627 kW power is produced at 1000 °C for the electrolyte-supported model. The highest electrical efficiencies for the anode-supported model and the electrolyte-supported model are 64.6% and 58.3%, respectively. Besides, the lower value of the steam to carbon ratio is favorable for increased power output from the fuel cell and consequently a high SOFC efficiency.

Automated System for Fleet Benchmarking and Assessment of Technical Condition

2017 ◽  
Author(s):  
Brage Mo ◽  
Petter Dehli ◽  
Christian Steinebach ◽  
Tow Foong Lim ◽  
Lokukaluge P. Perera
Keyword(s):  
Business Processes ◽  
Fuel Efficiency ◽  
Power Production ◽  
Condition Index ◽  
Technical Condition ◽  
Automated System ◽  
High Fuel Efficiency ◽  
Performance Reports ◽  
Cost Efficient ◽  
And Performance

On-board Energy systems in vessels have to use fuel efficiently to maintain ship speed at lowest possible costs. This paper describes how to use ship operational data to improve and maintain efficiency of the vessel’s power production with respect to the condition and performance of equipment. The paper describes an overview of an automated Technical Operations Performance (TOP) Monitoring service. TOP monitors the performance of marine main and auxiliary diesel engines by use of the information collected onboard vessels at regular intervals. Performance data are stored in xml-reports sent as email attachments from ship to shore. This communication is reliable and cost efficient for merchant ships that are on-line only for shorter periods. Load, ISO and environmental corrections make results valid for benchmarking and trending. The service aggregates the hierarchical information obtained from different sources by transferring measurement readings into unified indicators, the Technical Condition Index (TCI) [1]. Experts manually check the automatically generated performance reports and add additional guidance on options to improve power production and machinery conditions analyzing the available data with respect to different targets, such as low engine degradation and high fuel efficiency. The performance reports then influence business processes indicating possible causes for loss of performance in equipment and possible erroneous instrumentation, and the need for maintenance actions. The obtained TCI values show the performance of individual units, or for a fleet/class of equipment and vessels.

Energy Production and Performance of a Large Photovoltaic Roof

2003 ◽  
Author(s):  
Stefano Ubertini ◽  
Umberto Desideri
Keyword(s):  
Power Plant ◽  
Power Systems ◽  
Energy Production ◽  
Power Plants ◽  
Central Italy ◽  
Power Production ◽  
Great Promise ◽  
And Performance ◽  
Electrical Generation ◽  
Performance Results

The market for photovoltaic is rapidly expanding and there are some large utility PV power plants, thousands of residential systems, and tens of thousands of remote power systems in use. Even if photovoltaic is a technology that has already demonstrated its effectiveness and holds great promise in electrical generation, the costs are still too high to guarantee a commercial competitivity. This paper presents the performance results of a 15 kWp photovoltaic power plant installed on the roof of a high school in central Italy. The system consists of 220 modules for a total of 22 arrays, which are connected to inverters to allow conventional appliances to be powered by photovoltaic electricity. The PV plant is remotely controlled and data on sun radiation, ambient temperature, modules temperature and power production are continuously acquired by a PC. The measured power plant performances during the year are presented in this paper.

scholarly journals Design, simulation and performance evaluation of vertical axis helical wind turbine

2019 ◽  
Vol 2 (1) ◽  
pp. 1-13
Author(s):  
Bikash Karki ◽  
Ashok Subedi ◽  
Himal Sigdel ◽  
Pradeep Bartaula
Keyword(s):  
Performance Evaluation ◽  
Aspect Ratio ◽  
Rotor Blade ◽  
Vertical Axis ◽  
Power Production ◽  
Test Rig ◽  
Similar Nature ◽  
Good Source ◽  
Power Extraction ◽  
And Performance

This report is all about the design, simulation, fabrication, and performance evaluation of the VAHWT. The experimental data obtained via testing and data from CFD approach are used for performance evaluation. From the data obtained experimentally, the VAHWT so fabricated has been found to operate at the low cut-in speed of 3.18 m/s and maximum power output has been found to be 2.656 watts at the wind speed of 8 m/s. The maximum rpm of the rotor blade is recorded to be 722.2 rpm at the velocity of 11.53 m/s signifying its potentiality of wind power production. Besides, the data so obtained from both the process when analyzed through graph plots, has shown the similar nature slope wise. This simply signifies the generation of satisfactory data via experiment. In addition, the mechanical losses has shown difference between the experimental and data obtained via CFD approach. At the end, when applying CFD approach for evaluation of maximum efficient turbine varying the aspect ratio, has shown the turbine with aspect ratio of 0.6531 to be the most efficient with performance coefficient of 36.396%. However due to limitation in RPM and Test rig, the rotor blade with aspect ratio of 0.6956 was fabricated and used for evaluation experimentally. The data so obtained from both the process were concluded to be relevant to each other. Thus, the detail study on this project has led to the need and opportunity of VAHWT to be further researched and can be developed as a good source of energy producing system. It can also be economical method of power extraction from wind in the countries like Nepal with growing urbanization.

Assessment of LNG Regasification Systems With Cogeneration

2000 ◽  
Author(s):  
Umberto Desideri ◽  
Claudio Belli
Keyword(s):  
Natural Gas ◽  
Economic Analysis ◽  
Power Production ◽  
Liquefied Natural Gas ◽  
Gas Pressure ◽  
Long Distance ◽  
Working Fluids ◽  
Pipeline Networks ◽  
Combined Cycles ◽  
And Performance

Natural gas is usually transferred to consumers through pipelines, which may cover distances of thousands of kilometers. In some cases, however, when the path of the pipelines crosses seas or countries where the politic situation does not ensure a continuous and reliable flow, other means of transportation are preferred. In these cases, the natural gas is liquefied and transported in tankers, which load the tanks at liquefaction plants and discharge them at regasification plants. This gives a considerable chance to differentiate supply sources and allows gas imports from producing countries that are otherwise inaccessible via pipeline. The aim of this paper is the study of systems, which carry out liquefied natural gas (LNG) vaporization using cogenerative solutions. The following configurations were studied in particular: • Gas-steam combined cycles; • Closed gas-gas combined cycles using three different working fluids. Two typical plant sizes and two gas pressure sendout levels (7.3 MPa for long distance pipeline networks and 2.5 MPa for terminals linked to power production plants with combined cycles) have been analyzed. The suggested solutions have been optimized, and performance calculated. The discussion is completed by a simplified economic analysis.

Transmission Scanning Electron Microscopy and Energy Analysis with the Siemens ELMISKOP 101

1972 ◽  
Vol 30 ◽  
pp. 450-451
Author(s):  
H. M. Thieringer
Keyword(s):  
Objective Lens ◽  
Transmission Microscopy ◽  
Image Recording ◽  
Mode Of Operation ◽  
Scanning Transmission ◽  
Electron Microscopes ◽  
And Performance ◽  
Convergent Beam ◽  
Ray Path ◽  
Beam Diffraction

It has repeatedly been show that with conventional electron microscopes very fine electron probes can be produced, therefore allowing various micro-techniques such as micro recording, X-ray microanalysis and convergent beam diffraction. In this paper the function and performance of an SIEMENS ELMISKOP 101 used as a scanning transmission microscope (STEM) is described. This mode of operation has some advantages over the conventional transmission microscopy (CTEM) especially for the observation of thick specimen, in spite of somewhat longer image recording times.Fig.1 shows schematically the ray path and the additional electronics of an ELMISKOP 101 working as a STEM. With a point-cathode, and using condensor I and the objective lens as a demagnifying system, an electron probe with a half-width ob about 25 Å and a typical current of 5.10-11 amp at 100 kV can be obtained in the back focal plane of the objective lens.

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